on February 20, 2023
Optimal projection to model solar shadows
Geographic Information SystemsWhat is the projection of the shadow? Projection refers to the externalization (sending out) of the shadow—the unconscious aspects of yourself, such as positive or negative needs, feelings or ideas you are not aware of having. How do you calculate sun position shadow? The measurement of the length of the shadow depends on the height
on February 20, 2023
Importing GDAL in Jython?
Geographic Information SystemsHow to import GDAL into Python? How to Install GDAL for Python with pip on Windows Download a pre-built gdal wheel file. With pip we can use a wheel file to install a package. Install the wheel file with pip. Now all you have to do is install the wheel file with pip . Test
on February 20, 2023
Marker Not being removed : leaflet
Geographic Information SystemsHow do I remove a marker from a leaflet map? Quote from video: We will be using remove marker function along with leaflet proxy to remove specific markers based on a click event. So here we have the map we'll be using the quakes dataset. How do you put a marker on click in leaflet?
on February 20, 2023
How to fix the “Snap tolerance” error message in QGis?
Geographic Information SystemsHow do I enable snapping options in QGIS? To set up basic snapping: Open your Mergin Maps project in QGIS. Go to the Project Properties. Navigate to the Mergin Maps tab and change the snapping settings to Basic snapping. Apply the changes, save and sync your project. Don’t forget to synchronise the project also in
on February 20, 2023
How to digitize a “ringed” topographic-style choropleth map?
Geographic Information SystemsHow do you Analyse a choropleth map? First read the instructions and colour legend/key to understand what the shading means. Look for the regions with the largest value shades, then look for the lighter colours to see the low values. Look out for any significant regional patterns – maybe neighbouring areas are a similar shade
on February 20, 2023
Clipping a section from google map as geotiff
Geographic Information SystemsZoom to the area you want. Go to project -> Save as image and choose tif. Open the image, provide the correct projection info (EPSG: 3857) Right click the image in the layers panel -> save as Gtiff. Can you export GeoTIFF from Google Earth? You can export images from Earth Engine in GeoTIFF or
on February 20, 2023
PostGIS, create centroid column from polygon column
Geographic Information SystemsHow do you find the centroid of a polygon? How do I compute the centroid in a polygon? Write down the coordinates of each polygon vertex. Count the vertices and denote their number by n . Add all the x values from the vertices and divide the sum by n . Add all the y
on February 19, 2023
Turning off cache in FME?
Geographic Information SystemsYou can turn feature caching off from the Run menu > uncheck “Enable Feature Caching”. How do I turn off caching? Here’s how… When you’re in Google Chrome, click on View, then select Developer, then Developer Tools. Alternatively, you can right click on a page in Chrome, then click Inspect. Click on the Network tab,
on February 19, 2023
Select duplicates that appear in two columns using QGIS
Geographic Information SystemsHow do I find duplicates in two columns? Navigate to the “Home” option and select duplicate values in the toolbar. Next, navigate to Conditional Formatting in Excel Option. A new window will appear on the screen with options to select “Duplicate” and “Unique” values. You can compare the two columns with matching values or unique
on February 19, 2023
Deferred functions, Leaflet with GeoJSON
Geographic Information SystemsHow do I add a GeoJSON file to leaflet? GeoJSON objects are added to the map through a GeoJSON layer. To create it and add it to a map, we can use the following code: L.geoJSON(geojsonFeature).addTo(map); What are the style options for leaflet GeoJSON? Style GeoJSON Visualization Point. LineString. Polygon. MultiPoint. MultiLineString. MultiPolygon. How do